Flat type duplicator



July 25, 1939. 5, HANSEN 166,992

FLAT TYPE DUPLICATOR File d Aug. 15, 1938 2 Sheets-Sheet 1 ww- 15 ll J 771/677 2 o 7 (Flak/2'71 J fiansen,

July 25, 19391., M. s. HANSEN FLAT TYPE DUPLICA'I'OR Filed Aug. 15, 1938 v 2 Sheets-Sheet 2 flii'orwey s Patented July 25, 1939 UNLTED STATES PATENT QFFliIE FLAT TYPE DUPLICATOR Mahlin S. Hansen, Indianapolis, Ind.

Application August 15, 1938, Serial No. 224,843

8 Claims. (Cl. 10l125) This invention relates to duplicating devices glass is set below the boundary edges of the side of the type wherein a stencil is initially out and walls and ends of the box II so as to provide a then laid over an ink pad to receive a sheet of retaining ridge therearound to receive the copy paper thereover for an impression of ink through and stencil sheets therebetween and on the glass the stencil. it. The glass l 0 is carried within retaining A primary object of the invention is to provide grooves in the box side walls and ends in a manmeans in a common unit which will maintain the ner sufiiciently loose as will permit the insertion stencil in a warm condition and support it over of retaining clips I2 particularly at each end of the a uniformly lighted table while it is being cut, and glass, the stencil and copy sheets having their ends l!) at the same time will permit warming of the ink overlapped by these clips as indicated in Fig. '7

pad by the common heating and lighting means so Where the copy sheet I 3 is shown as being in conas to permit speed in the sequence of operations tact with the glass it and the stencil sheet l4 from the cutting of the stencil to the making of overlies the copy sheet l3, both sheets preferably the final impressions. extending by their ends under the respective clips A further important object of the invention is I2. 15 to provide means for initially heating and main- Each of the side walls of the box I i is provided taining the stencil in a softened condition so as to with a number of pockets i5, here shown as two permit use thereof without danger of cracking or in each wall, and these pockets are sufficiently checking and without initial delay. large to receive a lamp I6 therein, the lamp pref- The structure iorming the invention lends itself erably being of a cylindrical or pencil type. The 20 particularly to the making of multi-colored final lamp is carrier by any suitable socket device such impression by the use of a plurality of stencils and as the structure indicated in Fig. 4, and electrical separately colored ink pads properly brought into conductors H and I3 interconnect the lamps in register by the device. parallel with an outlet receptacle l9 carried in one 1.3 These and many other objects and advantages end of the box I. of the invention will become apparent to those The other side of the box II is enclosed by a versed in the art in the following description of. board or plate 20 which carries an ink pad 2| on one particular form of the invention as shown by its outer face. This plate 20 is entered from one the accompanying drawings, in which end of the box I i into grooves cut in the side Fig. l is a plan View of the imprinting side of walls. A strip 22 is removably carried by the end 30 a structure embodying the invention with various 23 of the box I i, from which end the plate 28 is elements broken away to disclose the interior inserted. This strip 22 has its end interengaging thereof; with the side walls of the box H in any suitable Fig. 2, a central longitudinal vertical section manner such as by a dovetail arrangement, and

3.3 through the device; is maintained in position by a latch comprising Fig. 3, a detail on enlarged scale on the line a pin 24 passing through the strip 22 and received 3-3 in Fig. 1; within a socket in the end wall 23, Fig. 3. Thus Fig. 4, a detail on enlarged scale on the line by removing the strip 22, the ink pad plate 2% may 4-4 in Fig. 2; be withdrawn from the box at will and like plates Fig. 5, a view in perspective of the imprinting inserted in its place. 40 side of the device with the cover removed; The ink pad plate 20 has a corner cut away to a detail in Vertical 560131011 roug a leave a window 25 in one corner, preferably the end of the device; and left-hand corner, Figs. 1 and 5. This window is Fig. 7, a top view in perspective of the stencil provided to facilitate the handling of the sheets of cutting side of the device. paper 26 which are placed over the stencil i i to 45 Like characters of reference indicate like parts receive the impression. The papers are laid on throughout the several Views in the drawings. the stencil one at a time and the roller 2? passed I form a box-like structure to carry a transluthereover in the usual manner, the paper being cent glass ill as a bottom enclosure. This glass lifted behind the roller. This lifting is quickly it may be of any type such as ground or sandaccomplished by permitting the operators finger 50 blasted glass which will set up a diffusion of light to grasp the corner of the sheet 26 where it profrom individual sources. This glass ii! is preferjects over the window 25. ably mounted in the box, which is generally des- Normally this side of the device is covered by ignated by the numeral l l, to be held in a pera lid 28 when the device is not in operation. This manent manner against removal. Preferably the lid 28 covers the entire area of the box ii and is 55 heat from the lamp I6.

The side walls at least of the box II are provided with vent holes, here shown as slots 30, two

being formed through the box wall in each pocket In operation, the initial position of the device is that as shown in Fig. 7 where the glass I is then uppermost. The lamps I 6 are illuminated by bringing any suitable source of current into circuit through the receptacle I9. The entire interior of the box II including the under side of the plate 20 is preferably made to be of a light-reflecting nature. The lamp I6 being set back in the recesses in the side Walls of the'box, and the glass I0 being of a translucent and diffusing nature, the entire area of the glass I 0 then appearing is equally and uniformly illuminated so that the lines on the copy sheet I3 may be readily traced and followed in cutting the stencil sheet I'4 laid thereover.

Since the lamps inherently produce heat an advantage is taken of this fact by permitting air to circulate through the box by reason of the presence of the vents 30. This circulation prevents the glass plate from becoming too warm for good cutting of the stencil but at the same time there is suflicient heat afforded to make the stencil sufficiently pliable for easy cutting and sharp line Work.

After the stencil sheet I4 has been cut, the sheet is removed and the device is turned over to have the glass II] on the under side as indicated in Figs. 1, 2 and 5. While the stencil is being cut, the ink pad plate 20 was being warmed by the The cover 28 is removed and the stencil laid over the ink pad 2| to have its ends engage under the clips I2 whereby the stencil will be maintained in a smooth condition without tendency to lift or shift. Where the paper sheet 26 is shorter than the largest size usable on the device, such as the ordinary letter size sheet in place of the legal size sheet, a locating stop 3| is provided to have its ends fit rather snugly into transverse slots provided across the edges of the said walls of the box II, as indicated in Figs. 1 and 5. The sheet 28 may then have its lower edge brought against this stop 3| so as to properly position it on the stencil I4. The sheet 26 is then pressed against the stencil sheet I4 in the usual manner by starting the roller 21 at the .upper edge and carrying it toward the lower edge as the sheet 26 is lifted up thereafter.

The ink in the pad 2| is kept at the proper and desired temperature even though the room temperature may be low by reason of the heat supplied from the lamp I6, this heat being prevented from becoming excessive by reason of the vents 30 permitting circulation of air through the box. 7

As above indicated, this device is very well suited for use in multi-colored work. For example, a number of stencils I4 may be cut, one each for each separate color of ink to be employed. Then there is provided a separate ink pad plate 20 for each color of ink. For that particular color stencil, there is placed in the device a corresponding colored ink on its own plate 213 and the sheet 26 is impressed thereover for that particular color. Then .the subsequent color ink invention in the one particular form, it is obvious that structural variations may be employed without departing from the spirit of the invention, and I, therefore, do not desire to be limited to that precise form beyond the limitations as may be imposed by the following claims.

I claim:

1. In a flat duplicator, side and end enclosing walls, a diffusing glass secured by the walls, 'an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps.

2. In a fiat duplicator, side and end enclosing walls, a diffusing glass secured by the walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the Walls, said walls being provided withvents adjacent the lamps, said walls being provided with guides to receive said plate in a sliding manner over one of the walls, whereby said plate may be rapidly interchanged with other ink pad plates, and shiftable means normally retaining the plate in position.

3. In a flat duplicator, side and end enclosing Walls, a diff-using glass secured by the walls, an ink 'pad plate also carried by the Walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, said plate having a window therethrough-at one corner.

4. In .a fiat duplicator, side and end enclosing walls, a difiusing glass secured by the walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, said glass having an area sufiicient to receive a stencil sheet thereover, and means engaging said walls compressibly retaining the stencil sheet in a fiat condition over the glass.

5. In a fiat duplicator, side and end enclosing walls, a diffusing glass secured by the walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, said walls being provided with guides to receive said plate in a sliding manner over one of the walls, whereby said plate may be rapidly interchanged with other ink pad plates, and shiftable means normally retaining the plate in position, and stencil retaining members compressibly engaging between said guides and said plate to retain a stencil sheet thereover.

6. In a flat duplicator, side and end enclosing walls, a diffusing glass secured by the walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, and a sheet locating strip removably positioned across said plate and engaging opposite walls.

7. In a flat duplicator, side and end enclosing walls, a diflusing glass secured by the Walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, those walls carrying said lamps being formed to have recesses within which the major portions at least of the lamps are received.

8. In a flat duplicator, side and end enclosing walls, a diffusing glass secured by the walls, an ink pad plate also carried by the walls, said plate and glass being mounted in spaced apart relation, and a plurality of illuminating and heating lamps carried by the walls, said walls being provided with vents adjacent the lamps, those walls carrying said lamps being formed to have recesses within which the major portions at least of the lamps are received, and said vents being located 10 

